the.com/reserve

The art of keeping something back so it still has value when you need it most.

means To hold something back or set it aside rather than spending, using, or revealing it all at once.

from From French réserver, from Latin reservare — 're-' (back) plus 'servare' (to keep, to save). The same 'servare' root gives us 'conserve' and 'preserve,' all cousins in the business of not letting things run out.

military origin
Reserve troops were held back from battle on purpose
banking rule
Banks must legally reserve a fraction of deposits
personality trait
Calling someone reserved is a compliment and a warning
wine term
Reserve wine often just means marketing, not aging
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